Crossword Genius

Prop up (7)

Ross

I think it could be either:

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5

7

bolster

'prop up' is the definition.
(bolstering is a kind of propping up)

This is the entire clue.

(Other definitions for bolster that I've seen before include "Lobster (anag.)" , "Chisel - long cushion" , "Extended pillow" , "support for head after retiring" , "Strengthen - long pillow" .)

I've seen this clue in the Evening Standard.
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